Weiwei Song, Jun Tan, R. Integlia, Lianghong Yin, Wei Jiang
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Ultra-high sensitivity in a photonic crystal superprism due to the curvature singularity of a dispersion surface
A superprism structure is shown to achieve refractive index sensitivity 3×104deg/RIU with low optical loss. The sensitivity is drastically larger than previously reported values and is not due to slow light effect at a bandedge.